Hollow shoe-form.



S. M. NILES.

HOLLOW SHOE FORM.

APPLICATION FILED JAN. 2. I913.

1,156,429. Patented Oct. 12, 1915.

COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

TnnsrATEs rArEN un on,

p snYMonRM; mas, amass; MASSACHUSETTS.

HOLLOW sHon-Fonn.

T all whom it may concern.

Be it known that I, SEYMOUR NILES, a citizen of the United States, residing at Saugus, countysof Essex, State of Massachusetts, have invented a certain new and.

useful Improvement inHollow Shoe-Forms, of which the following is a specification, reference being had therein to theaccompanying drawings. I I The invention relates to last. 1 The last or form consists essentially of a closed and seamless hollow metallic form, preferably having a transverse brace and a vertical brace entirely inclosed within the form and secured in position by projections from the inner face of the form integral therewith and engaging with saidbraces.

The process of making the said form comprises essentially the forming of a solid duplicate or mold of a last of some substance which is cohesive but which fuses at a lower temperature than the hollow metallic last which is to be produced, inserting into this mold the rods which are to form the braces of the last, coating the entire surface of the said mold and the ends of said rods with a a hollow metallic coating of electric conducting material, such for instance as graphite, making an electrolytic deposit of metal on the entire surface of the mold except for a small outlet hole through the shell formed by the metal deposit, then heatin the metal shell and inclosed mold thus formed sufficiently to fuse the mold so that it will flow out of the hole in the metallic shell.

The invention will be fully understood from the following description taken in connection with the accompanying drawings, and the novel features thereof will be pointed out and clearly defined in the claims at the close of this specification. 7

In the drawings: Figure 1 is an elevation showing the fusible mold which is a duplicate of the model, with the rods for the braces inserted therein and a suspension hook inserted in the heel so that it may be hung toe downward. Fig. 2 is a view similar to that shown in Fig.1after the mold has been coated with the electric conducting material. Fig. 3 is a view showing'the coated mold suspended in an electrolytic solution and mechanism for rotating the pattern while securing the deposit. F igwl is a vertical longitudinalsection showing the mold v Specification of Letters Patent.

7 I Patented Oct. 12,1915. Application filed January 2, 1913. Serial N 0. 739,689.

from the electrolytic. bath, and before the 5 suspension hook has been withdrawn. Fig. 5 is a longitudinal section of the completed last after the hook and the fusible mold have been removed. Fig. 6 is a vertical cross section of the finished last on line 66 ofFig. 5. r r Referring now to the drawings,1' represents a fusible mold or duplicate of the original model and is made of a cohesive material which is fusible at a relatively low temperature. "One way of makingaithis fusible mold is to make a plaster of-Paris mold of the model. p

Then the inside of each half of the plaster of Paris mold is coated with graphite or some other suitable substance to prevent the fusible substance from adhering to the plaster of Paris. Then melted wax or some other suitable fused substance is run into the plaster of Paris mold and allowed to solidify, forming a duplicate of the model;

The rods for the braces are then inserted into the body of the fusible mold 1, preferably two rods, one of these being for a transverse brace 3 above the arch portion and abouthalf way to the top, a'nd'the other brace 4 being a vertical brace in the fore part, extending from the top to the bottom. Each of these rods 3, 4, is preferably formed with a recess or depression 6 in each end. The hook portion 7 of a wire hanger 8 is then inserted intothe heel end of the fusible mold so that the said fusible mold may be suspended in the electrolytic bath. After bath 9 by means of the hanger 8 which is connected with mechanism whereby the mold 1 is given a slow rotation on its axis while the metallic deposit is taking place so that there will be an even coating of the metal.

Any suitable means may be employed for rotating the mold, the means shown consisting of a bevel gear 10 through the hub of which the wire hanger extends and which is clamped therein, said bevel gear 10 meshing with a gear-"11 on a driving shaft 12.;

The wire hanger 8 is connected by a Wire 13 with one pole of a battery 14 which is diagrammatically represented, the other pole of the battery being electrically con nected by a Wire v15 with the metallic anode fusible'mold being in, operation, the metal 16 which is preferably copperbut may be of any othersuitable metal. When the electric connections are made and the current turned on, the. rotating mechanism for the from-the copper anode will be deposited on the entire surface'of the mold, entering the depressions in the ends of the rods 3, 4: and forming'protuberances 18. When a deposit of the desired thickness has been made,

the current is shut off and the rotation of the i I mold is stopped-and the mold with its;me-

tallic coating or shell '17 is withdrawn from the, bath. Any extra d}p0sit of metal around the Wire hanger Where the wire passes through theshell into the 'mold should be scraped away, and then by tipping the wire and pulling it, at thev same time the'wirevcan be drawn out without leaving any hole except the size of the wire, where the wire passes through;

{The metallic shell 17 with its lnclosed fusiblemold is then heated sufliciently to reduce the fusible mold to a fluid. If wax or somerother readily fusible material ,is used for; the mold, the fusionmay conveniently be accomplished by immersing the shell with i I inclosed mold in hot water.

, flcpies of this patent may be obtainedlfor 'Whenreduced to a fluid, the fluid sub: stance will flow out of the small hole left by the withdrawal of the wire, leaving the shell entirely closed except for the, small holeleft by the Wire, and the brace rods 3, a

" willbe securely held in position by the protuberances 18 engaging with the depressions (in-The device can be used either as a last or as a shoe form and will be very light and strong i a What I claim is: i v

' v11A hollow metallic shoe form or last having a brace rod extending from the inhaving a brace rod extending from the interior surface of 'one wall to the interior surface of another Wall, sald brace bem'g formed'with a recess in each end andthe inner surfaces of the said walls having integral therewith protuberances which en gage the said braces in said recesses.

In testimony whereof I affix my signature, in presence of two witnesses.

. SEYMGURM. NiLns.

Witnesses:

VILLIAM A. COPELAND,

.ALioE H; MORRISON;

five cents each, by addressing the Commissioner of Patents Washington, D. G. V 

